body{
    background:url("图3.jpg");
    background-repeat: no-repeat;
    /*background-position:center;*/
    text-align: center;
    height: 100%;
    width: 100%;
}

h1{
    text-align: center;
    text-shadow: 10px 20px 7px #000000;
    font-size: 50px;
}

#p1{
    text-align: center;
    text-decoration: underline;
    font-size: 30px;
}


#p2{
    font-weight: bold;
    text-align: center;
    font-size: 30px;
}